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Two plane mirrors are kept on a horizont...

Two plane mirrors are kept on a horizontal table making an angle `theta` with each other as shown schematically in the figure. The angle  is such that any ray of light reflected after striking both the mirrors returns parallel to its incident path. For this to happen, the value of `theta` should be

A

`30^(@)`

B

`45^(@)`

C

`60^(@)`

D

`90^(@)`

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The correct Answer is:
D
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